Machine for operating on the bottoms of boots and shoes.



T. G. PLANT.

MACHINE FOR OPERATING ON THE BOTTOMS OF BOOTS AND SHOES. 1907. RENEWED APR. 12, 1910.

APPLIOATION FILED MAY 13 Patented ma 1?, 1910.

14 SHEETS-SHEET l.

REESE T.G.PLANT.

G ON THE BOTTOMS OFBODIS A ND SH APPLIUATION FILED MAY is, 1907. RENEWED APR. 12, 1910.

OBS.

MACHINE FOR OPERATIN 958 69 Patented May 17, 1910.

14 SHEETS-SHEET 2.

T. G. PLANT. MACHINE FOR OPERATING ONTHE BOTTOMS 0F BOOTS AND SHOES. APPLICATION FILED MAY 13, 1907. RENEWED APR. 12, 1910. 95,860

v 'T. G. PLANT. MACHINE FOR OPERATING ON THE BOTTOMS OF B OOTS AND SHOE S.

APPLICATION FILED MAY 13, 1907. RENEWED A Patented May 17, 1910.

14 SHEETS-SHEET 5.

MW M m J- T. G. PLANT. G ON THE BOTTOMS OF BOOTS AND s11 OBS.

MACHINE FOE OPERATIN APPLICATION EILEEMAYJQ, 1907. RENEWED APR. 12, 1910.

Patented May 17, 1910 14 sHEETs-sEEET 6.

a 2 a a o 4 6 wwmw z s a o .i m w 9 a 2 m 8 N s 4 w T. G. PLANT. MACHINE FOR OPERATING 0N THBBOTTOMS OP BOOTS AND SHOES. APPLICATION FILED MAY 13, 1907. RENEWED APR. 12, 1910.

3 Q v TMW WQQM T. G. PLANT. MACHINE FOR OPERATING on THE BOTTOMS 0P BOOTS AND SHOES. APPLICATION FILED MAY 13, 1907. RENEWED APR. 12, 1910. 95$fi6 Patented May 17,1910.- 14 SHEETS-SHEET 8.

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MACHINE FOR OPERATING ON THE BOTTOMS 0F BOOTS AND SHOES. APPLIOATION FILED MAY 13, 1907. RENEWED APR. 12, 1910.

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08 H ff W3 94 0% j 2/0 f i! I n r? 208 is /52 /5 Patented May 17, 1910.

14 SHEETS-SHEET 9.

Fig.1.

. T. G. PLANT. MACHINE FOR OPERATING ON THE BOTTOMS OP BOOTS AND SHOES.

APPLIOATION'PILED MAY13, 1907. RENEWED APR. 12, 1910.

Patented May 17, 1910. 14 SHEETS-SHBET 10. mv me T. G. PLANT. I MACHINE FOR OPERATING ON THE BOTTOMS OP BOOTS AND SHOES.

' APPLICATION FILED MAY 13, 1907. RENEWED APR. 12, 1910.

95,6 Patented May 17, 1910.

14 SHEETS-SEEET 1i.

WMSSQ v V I 11 1 Mr J"; (,M f MW- 1 mm ml a KZKf/M w M T. G. PLANT. MACHINE FOR OPERATING ON THE BOTTOMS OF BOOTS AND SHOES, AIPPLIOATIOH FILED MAY 13, 1907. RENEWED APR. 12, 1910.

Q6 Patentedfflay 17,1910.

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T. G. PLANT. MACHINE FOR OPERATING ON THE BOTTOMS OF BOOTS AND SHOES. APPLIOATiON FILED MAY 13, 1907. RENEWED APR. 12, 1910.

14 SHEETS-BHEBT 13.

FWJK A26 A26 breasting knife C. The work support A is guided and supported against lateral dis placement during movement about its pivot, by means of a guide slot (Fig. 13) formed in a table 31 mounted rigidly on the machine frame.

Referring now to Figs. 1, at and seated in the enlarged upper extremity of the holbeyond the adjoinin low post of the work support A is the base of a jack standard 32. This standard 32 comprises arms 33, 33 in which are journaled trunnions 34, 34C, of a gimbal 35. Mounted in the gimbal 35 is a stud 36 which has its axis disposed substantially perpendicularly to that of the trunnions 3a, 3a; and upon the stud 36 'are mounted the two scissor-like members 37, 37, constituting one formof expansible work support, shown herein as a jack (Fig. 5). Each of the jack members 37, 37 has a downwardly extending ,arm; and the arms are connected by a spring which tends to hold the jack in its normal closed or contracted condition. This spring is opposed for expanding the jack,

ently described, it expands the jack mem-.

here 37 37 by an action similar to that of opening scissor blades. As best shown in Figs. 4c and 5, each jack member has at its upper extremity a horizontally disposed plate 39, loosely pivoted to the jack member. Each plate 39 extends laterally somewhat surface of the jack member; and through the lateral edges of the plates 39, 39 the jack when expanded engages a shoe. The pivoting of the plates 39 permits them to assume various positions in conformity to the interior shapes 01" the shoe against which they are pressed by the expanded jack.

Referring now to Fig. l: the roll is journaled in the bifurcated upper end of a plunger d0, mounted in the Work support A and normally depressed by an appropriate encircling coil spring which bears at its upper end against the lower edge of the jack base 32. To expand the jack, the plunger 40 is moved vertically upward; and in order that the expansion of the jack shall be yielding, the plunger 40 is given its vertical movement through the agency of a compensating spring 4C2, also mounted in the,

Work support A, and interposed between the plunger 40 and its actuating plunger 44. A. link 46 connects the lower end of the actuating plunger 44-.- with a collar 48 fixed upon the stationary stud 30 in the machine base. lhe link 46 is pivoted to the collar 4&8 eccentrically of the stud 30, in such a manner that movement of the work support it about its pivot toward the left in Fig. 1, has the efiect of moving the upper extremity of the 'esasoe support is moved from its shoe receiving position 1) toward its operative position (Fig. 4) the actuating plunger 44: will be elevated, it will compress the spring t2, elevate the plunger :0, force the roll 38 vertically upward between the depending arms of the jack members 37 37 and will expand the latter. A shoe having been placed upon the jack when in its shoe receiving position, the expansion of the j ack will serve to grasp the shoe firmly from within; and the shoe will he held thus firmly while the jack remains in operative position (Fig. i) and until it is returned to its shoe receiving position shown in Fig. l.

Referring again to Figs. 1, t and 5: it has been stated that the expansible jack with its for securing the jack in adjusted position about the axis of trunnions 34, 34, so as to predetermine, it desired, the angle between the breasting knife (I and the tread face oi the heel, so that the tread angle or pitch of the finished breast may be definitely regulated in advance and may be varied as circumstances require. To the end just sug gested, the jack base 32 has an ear in which is pivoted an eye-bolt 53, the threaded por tion of the eye-bolt being engaged by an adjusting nut 52 4). The nut 52 has a collar 54 at its lower extreinity,which supplies one sideof an annular groove on the nut; and in said groove is a sleeve 56. This sleeve 56 is mounted on trunnions 58, journaled upon-an ear extending from the gimbad 35. With this arrangement the entire jack head, com rising the members 37, 37, may be adjuste angularly on the trunnions 34:, 34 by turning the adjusting nut 52; and

the jack will be held in whatever adjusted position it has been given.

To summarize: the specific work support A disclosed for purposes of illustration is movable from a shoe receiving to an operative position. The work support comprises an expansible j ack, arranged to clamp a shoe from within while the'latter is undergoing the breastingoperation. l he jack is made angularly adjustable so as to provide for varying the tread-angles of heel breasts.

ltt will be hbserved that the specific form of expansible worlr support which has been described is intended to be used s a jack in the absence of a wooden lasts-that is to say, the wooden last upon which the shoe is mounted during mostot the thoe making operations would. he removed before introfor the jack form of Work support hereinbefore described some such arrangement as is shown in Fig. 9. As disclosed by way of exeniplification in Fig. 9, the work support arranged toreceive a last, comprises a base 59, mounted in the upper end of the Work support A. Trunnioned on the base 59 isa unitary jack member 60, havingv a last pin 6:2. This. former Work support or jack has provision for the angular adjustment already referred to; and this provision includes an eye-bolt 64; and adjusting nut 66, similar both in construction and mode of operation to the eye-bolt and the nut 52 already described' For convenience of illustration the work support of lfiig. 9 is not shown as expansible. Either of the described forms of work support or jack may be employed in connection with suitable means to perform the intended work of the machine; but it is preferable to use a construction embodying features of the invention. as exemplified in the expansible members 87, 37, though this is not indispensable.

Referring again to Fig. 1: when the shoe has been properly placed upon the shoe support A, the latter is moved to the left until the shoe heel stands beneath a presser-foot B. Thereupon, by treadle-operated mechanisrn hereinafter described, the presser-foot is moved down to engage the heel with suiticient firmness to assist in holding it in any position to which it may be moved, without preventing its ready manipulation by the operator. This same treadle operation which initially introduces the presser-foot is conveniently utilized also for presenting in operative position one of a pair of side gages l) by which the adjustment of the shoe in a. horizontal plane may be determined by moving some portion of the shoe into contact with the then stationary side gage. l The gages D, D are shown in their inoperative and preferably normal positions, in

front elevation in Fig. 2, in detail plan view in Fig. 6, and in rear elevation in Fig. 7. The operative positionof one of the gages, with relation to a shoe, shown in dotted lines in l ig'. 6. 7

As illustrated in Fig. 2', each gage D conof a vertically disposed pin integral with a block 68 which is ustably mounted on a squared outer extremity of a gage arm 70. Each gage I) may be adjusted endwise on its arm 70 and may be fixed in adjusted position by a set screw 73. The arms 70, 70

are t'ulrrumed on stud bolts 72, 72, mounted in blocks 74;, 7' The axes of the stud bolts 72, 72 are inclined so that when one of the arms 70 stands in its inoperative position it shall be displaced not alone laterally from the shoe, but also vertically, so as to be removed entirely from a position oi nus,

fer-ence with the shoe adjusting movements. When an arm '20 is moved into operative position it ti'avels at once dou mvzu'dly and toward the shoe. @ne of the D is shown in the drawings at a greater elevation than the other (as for example in Fig. 7). Both gages as shown in 7 occupy their no anal inoperative positions; but the on the left is held in the position shown bv l the interference of the machine frame.

The rear extremities of the T0 are connected by a spring" 2'6 which tends to separate the gages D, D and to hold them in their inoperative positions. The action of the spring 7'5 limited and controlled by means oi? gage throwing fingers 78, '79, tulcrunied on pins 80, in bracket of the machine frame; When it is desired to throw one or the other of the gages it) into operative, position the appropriate finger 3'8 or T9 is reclred on its pivot 80 and thereby its associated gage arm 70 is moved on its fulcrum l2. ll hile one of the fingers ill or 'i'll is thus moved the other rein-air stationary, supplying an abutment against which the spring Tl) tends to more the then inactive arm 76, Vt ith this arrangement the lllOVtElllQll'h of an arm 0 is made in opposition to the spring 76, one end of which held stationary by the inactive linger 78 or '51). The fingers "Y8 and '39 are moved to the ends just suggested. through pinions 82, 82 ll) idly connected each to one of the ling 78, it One pinion 82 is engaged by a horiimntally movable rack 83 and the other is engaged by a second and independent racl: 'lhc racks 83 and 8d are mounted for endwise movement in Ways supplied. on the side bracket of the machine frame.

Referring again to Fig. 7 t the left hand end of each rack 83-, carries cani roll 86, engaging a segmental cam path on a cam block 88 or The cam blocks ee and iii) .are pivoted respectively on'stationary pins 90, 9Q. The cam blocks 88 and d) have lever arms to which are connected respectively treadlc rods 92 and 9d. Evidently, when one other for lett shoes, it being pre'leralne, for, .the our'ioses of the siecilic machine. to use that gage whieh is in a position to coopera e with the inner edge o if a shoe sole. For eis ample, the d ed lines in Fig. *3 snow the operative posmon of a gage which cooperates with the inner sole edge of a left shoe in order that the operator may at will introduce the gage which is appropriate to go arms "(0,

I o"? the screw 100 i115 a spire-.1

the shoe about tobe breasted,"right andflei't treadles are provided for operating, respectivcly, the treadle rods 02 and 9 1. lhus, when a right shoe is on the work support the operator depresses the right treadle and elevates the treadle rod 92 to throw in the gage D which is on the right of Fig. 7 and on the left of Fig. 0. in like manner, to introduce the gugefor a. left shoe the operator depresses the left treadle, elevotes the treadle rod 9 1 and introduces the gage D on the left of Fig. 7 and on the right of Fig. 0, as shown in dotted lines in the latter figure. These treadles are shown in side elevation in Fig. 11 and in plan view in Fig. 12. The treadle 06, when depressed, introduces a gage for a left shoe and the treadle 98 introduces a gage for a right shoe.

lit has been explained that the operator first swings the work support 1%. to the left in Fig. 1 and thereupon, by depressing u treadle, moves the resser-toot B into contact with the heel and at the some time introduces into operative position oneor the other ofthe gages D. When a gage is thus introduced the operator may ii: necessary, swing the forepert of the shoe laterally until it contacts with the then stationary gage; and the shoe being held thus throughout the bl-GZLStlIlg operation the gdge D serves to determine the angle between the operative position of the hr-casting knife and the ion gitudina-l median of the heel. The adjustment of the gage blocks 68, 08 lengthwise of the arms 70, 'Z 0 permits the'gages to be positioned properly-to contact with any desired point on a sole edge; and by means of this adjustment the gages D, lid-1118.2] he moved toward and from the axes about which they swing. This feature of adjustment may be utilized for varying the median angle or swing of the breast line determined by the gages respectively, since by moving a gage toward and from the axis on which it swings its operative position may be shifted slightly with relation to the longitudinal median of a shoe. It is preferred, however, to have a. further adjustment of the gages for varying their operative positions and thereby varying the mediun angles of breasts; and, to supply this preference, the blocks 7 74 (Fi 7), upon which thegage arms '4" 0 are tulcrumed, are mounted in slide ways in their supporting bracket so as to be lnovable toward. and from each other. The blocks 7st, 1 are ongaged by a right and left threaded screw 100, which is he-d against axial. 1H0? by engagement of its 3 :igid collar recess in the su porting hracl turn, is engaged by a spiral alt 106 having a handle wl in position to be conveni sconce "the machine. By turning the handle wheel 107 the operator rotates the screw 100 and thereby moves the blocks 74, 74 toward or from each other reciprocally. This serves to adjust the starting positions of the gages D, D, from which they move toward their operativepositions. The throw of each arm 74- (actuuted by a finger 7 8 or 7 9) is always of the some extent and consequently, the above described variations in the starting points of the gages serve to vary the opera-- time positions in which the gages shall stand.

the end or" their movements.- Whatever horizontal angnlgr. adjustment of the shoe is necessary tol' ring the sole edge into contact with its appropriate gage D, may be effected by moving the entire gaclr head and base angularly in its seat in the Work support A, this movement taking place about the axis ,of the latter. This movement is readily effected Toy-simply moving the shoe, since the latter is then tightly clamped ftom within so as to be substantially rigid with the jack( in breasting shoes mounted upon Wooden lasts, as hereinbefore suggested the engagement between the last pin 62 (Fig. 9) and its socket in the last is very rarely sufficiently snug to hold the last and shoe rigidly on the jack and for this reason it is preferable that some means he provided for cen tering the shoe with relation to the. work support. To this end (Fig. 8) counter clumps 108, 108 are provided to engage, preferably by rolls or the like, the counter of the shoe and to hold the latter centered between the rolls. The clumps 108, 108 are fulcrumed respectively or pins 110, 110 mounted in a block 112 which. is remov'ably secured to the some brecket which supports the. side gage arms 7 0. The clamps 108 have intermeshing sector gear arms which insure. that the movements of the clamps shall be reciprocal, The clamps are normally pressed together with considerable clamping force by a spring 11 1. The block 112 which supports the clamps 108, 108 is removably attached to its supporting bracket by a long screw 116 (Fig. ,9). When it is not desired to breast "shoe's on the last the clamps 108 may be readily removed by unscrewing the screw 116, and lifting sway the clamp block 112. its the shoe is moved from the position of its introduction rearwardly with the work support, the counter of the shoe is pushed between the clamps 108, 108 which thereupon automatically centerthe shoeand hold it thus centered while permittmg it to be shifted into proper relation with It has been-explained hereinbeiore tnet a.

single treadle operation serveshoth to more ge D into operative position end hee It is convenient to describe next the construction of the presserioot, and the b manner in WlHC ll it is introduced preliminarily by the treadle.

Referrin now to Figs. 10 15 16., 12' and 18: the resser-toot B comprises a block removably supported in, the bott m a presserdo-ot carriage 118. As shown in Fig 18 the resser-foot B is mounted in ways in the carriage 118 and is arranged to be locked in position by means of a spring plunger 120 on the carriage, which enters sh appropriate hole in the edge of the Presser-toot and maintains the latter in its proper position' The front edge of the Presser-foot is preferably curved in substantially the shops which is'dcsired to be given the heel breast; and when the pr sser-foot is in o erative position its curved edge stands closely adjacent to the path oi vertical movement of the knife. Thus, the resser-foot edge may serve asa gage since it indicates with fair accuracy the line which the knife will cut, The resser-foot B is readily removable from its carriage so as to be replaced by others having" difi'crentl shaped edges. The presser-fo0t carriage 118 is mounted upon. trunnion pins 122 at the bi.- furceted lower extremity of a presseratoot plunger 12%. The is also pi oted to an eye-bolt 126 having an adjusti ig not 128 pivotally mounted in an ear in the Presser? footplunger 12% By turning the adjusting out 128 (Fig, 1D) the resser-foot carriage, and with it the resser-foot B, may be adjusted angularly about the trunnions 122;

and in this manner lihfi'lllCllllitlllOll of the lower face of the resser-foot may be made to accommodate itseli' to any desired tread angle, The presseri'ootrlpluiiger 121 (Figs, 15 and 16) is inountedin e vertical. slide way in the machine firs-me and is connected (Fig. 10) by a screw 130 and adjusting out 132 with aif'oppositely threaded screw 13%, pivoted at the end of a 'n'esser-foot lever 136, The adjusting not 1823 cerries e soli e engaging the interior of a hub 'ievcl gear 188 mount-ed against ehdwise move ment in the machine roe. 11 second bevel gear engages the 1:10 is r gidly mounted on ah cr i shaft 14-2., By turning the slr 1592 the not 132 is rotated, thereby adjusting the relation between the presser-foot and the presser foot lever 136. The spline on the adjusting; nut 1-82 permits any practicable extent of vertical movement of the out while at the some time maintaining constant engagement with the gear 188.

Referring now to l ig. :2: the presscr-foot lever 136 is folcrumed on the frame olithe machine and is normally rocked to hold the resser-foot elevated by means ofa retracting spring 1414. Depending from the end of the resser-foot lever 136 is a treadle rod 1-16 which, at its lower end (Fig. 11), is conuected to a lever 1-18, fulcrumed upon the moved by the operator co e by means strolls one ofthe treadlos i being thereby elev 1 18 clockwise in vale the rod 1 16 1 v foot love? 136 contra-clot:ltwisc ii and depress the resser-foot until tac'ts with heel.

l'leretofore the descri tioh voted to the worlr gover i ig of the machine, including the work support and expansihle jack, the side ga; as the shoe ceiiterihg devices and the resser-foot. The power operation of the machine is started preferably alter the shoe has reached its final adjusted position; and this power oporation, in. its initial stages acts to force the presser-foot solidly against the heel, thereby clamping the latter firmly ii the worl support; and at the same time locks the ork support it in its then adjusted posi- 4 .311 111. this manner the shoe is held rigidly in its proper relation to the hreasting tool and is there maintained until, during the latter stages of the power operation, the resser-loot is retracted the wort: support is unlocked to permit its return to shoe receiving position. The power actuation of the resser-foot will be described first" Referring to Fig. 2: connected resser-foot lever 136 (in addi ion the treadle rod 146) there is a cam actusted rod 152. This rod is in two parts; and between been deits parts, is interposed a compensating machine irshiei lhvoted to the lower e entity of the slide pro. 158 111 hot: 160

to a cam lever ch shown in plan so "oiwited which at fwill am lever a cam 'ess-er-iioot path cam 16 1 shaft 0:6 the :oiochins. Vise shape oi" the cam s such that soon as the machine started the cam lover 162, the slide rod 158 and with it the resser-toot cam rod 152 are iorced vertically upward thereby rocking; the resser-loot lever 136 and forcing the pressc oi'oot down upon the heel of the shoe. The CQlfllPJllS-J spring 154- (Fig. 2) permits the rod 15.32 to yield axially in response to varying c, FJl ll1QSS8S of heel interposed between the jack ad the presseol'oot, The resser-foot ha 113.11g been thus actuated to clamp the heel firmly in place, the prcsser-iioot cam path 161 dwells until the machine is about to stop whereupon it releases the carolever 1652 to its norto the mal position and permits the elevation of the presser-foot by its spring 144 (Fig. 2). The upward movement of the presser-foot cam rod 152 is utilized to lock the. work support A in its adjusted position, and. the manner in which this is effected will be explained neXt.

Referring to Fig.8: there is shown in this figure a table 31, secured to the frame of the machine and having a guide slot shown also in Fig. 18-througl1 which the work support moves to and from its operative position. ltigidly mounted on the work support A (Figs. 3, 18 and 14) is a knurled locking surface 166 andwhen the work support stands in operative position as shown in Fig. 13 the knurled surface 166 stands adjacent to a second and movable knurled locking surface 168. The knurled surface 168 is formed upon a locking member comprising a plunger 170 arranged to be reciprocated toward and from the work support A in suitable bearings provided upon the lower side of the table 31. At its inner end the plunger 170 is pivoted to a locking lever 172, fulcrumed at 174 to the table 31. Between the plunger 1'70 and the fulcrum 174 the lever 172 has pivoted to it an actuating pin 176, normally spring pressed to the right in Fig. 18 to hold the knurled surface 168 out of engagement with the coiiperating surface 166 on the work support A. At its end the actuating pin 17 6 has a cam roll 178 to be engaged at appropriate times by'a cam 180, rigidly clamped upon the presser-foot cam nod 152. The cam 180 is shown in dotted lines in side elevation at the top of.

Fig. 3. As the resser-foot cam rod 152 is elevated to depress the presser-foot the cam 180 moves the roll 178 to the left in Figs. 3 and 13 and thereby rocks the locking lever 172 clockwise in Fig; 13 and forces the knurled surface 168 into locking engagement with the knurled surface 166 on the work support A. Thus, with the power depression of the resser-foot, the work support A is locked in position. It is preferable that the work support A be locked in position slightly in advance of the final power depression of the presser-foot; and the looking cam 180 on the presser-foot cam rod 152 is suitably positioned on the latter to secure the proper timing to this end. When a shoe has been properly adjusted; when the work support has beenlocked in adjusted position,

andthe presser-foot has been forced down upon the heel to clamp the latter securely in place, all is in readiness for the breasting operation which thereupon ensues, actuated by the continued power operation of the machine. Tt'is expedient at this oint to describe the construction and mo e of operation of the breasting knife. Tools of various sorts may be employed for cutting or otherwise shaping the heel breasts and these tools season screw 184 the distance between the screwhead and the cutting edge of the knife may be varied; and thereby the position of the cutting edge with relation to the knife carrier may be varied. This adjustment of a knife may be maintained even though the knife be removed from the machine since its adjusting screw 184 constitutes in effect a part of its shank and is removed with it. When the knife is returned to position, therefore (the screw 184 having in the meantime remained undisturbed), the knife blade may be returnccl to its former adjustment in relation to the knife carrier. This is of great convenience, since it is frequently desirable to remove a knife and with the arrangement contemplated by this feature of the invention this may be done without necessitating any readjustment of the. knife whenit is replaced.

The knife shank 182 is secured rigidly upon a knife carrier 186, the carrier having an ear 188 in which is'supplied a vertical aperture. In introducing the knife, the adjusting screw 184 is inserted vertically in the apertureof ear 188 and the head of the screw is moved upwardly until it abuts against an overhan ing portion of the slide 186. The knife is thereupon clamped firmly to the slide 186 by means of. a clamping screw 190, mounted in a cross piece 192 fastened to the knife slide 186. These parts are shown in horizontal section in Fig. 17. As an additional means for holding the knife on the slide 186, it is preferred to employ a locking block 187 (Figs. 10 and 23) which straddles and engages from beneath the head of the screw 184. The block 187 ,fits in a seat in the knife carrier 186 and is readily removable. It is held in position by a turn key 189 (Figs. 2, 10 and 23) As shown in F1g. 10 the edge of the knife on the side remote from the heel is somewhat,

inclined; and during the cuttin stroke of the knife there is a tendency orthis inclined edge to force the knife out of its intended vertical path. Also, other influences may tend to flex or otherwise inove the knife out of its proper path. To prevent this, the vertically reciprocating. knife carrier 186 (see Fig. 2) has downwardly projecting 

